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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d015c5645e21bdbfa2699ae6ee01ce6f0d8d6bad2e44d664c67934f510069df' 
  AND token = 'tPBvKHboed2fDhSG0wveVBRhuieW8/5mfWyBmX5W4Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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