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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1342eabad313ab1f7cdf12d46936acc9c56347e47f9a000e5bb191ea7e5102' 
  AND token = 'QKU2d2w67d1Jw5TLH5i9IIHjla+qgOqLFHLdW5Ngc6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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