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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3019f7ba243a813c564615f9a2c715f63c49c78565bc0d907b70fe3178c77e4' 
  AND token = 'cRfVF9qP5nJObjDrVa3tosLhuD8ZAmNjHFQOylR294g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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