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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d740d57d68dd248dd8d9953dd69660d79df56ef01fad2a08848e828eae2a71b' 
  AND token = 'UVnXTW/zzYN17lhCy5N9Q7Trg0B8/Xyv+vWiPf7EisE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}