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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050297e4a762231832b206f616c5fccdce56180723baa291d4a6309ccf3d9c9a' 
  AND token = '8F8teIe/b6sFBnFP64fSeluPiV3Zr9jwRA+0wxnrK9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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