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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74be227c64a1bc169bc0b9ba49ccbcafce0aaa969d8b02a29402aa1f1ba58ce6' 
  AND token = 'FJFTvfnOIbR6Hj2G3LcY+3N4N5vhUhV1MtxplJlxdDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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