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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3958fd086280bd32e0adcf82001d3cb6b6c0c1b2bde461bde833f3b6b08cd90' 
  AND token = 'ibQw/0DIx1+WPvRc6bekYDW6Nr8HS5/UYQFWrQWnS3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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