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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf94c8c0d8d15c23127890c9064f03475070de4c64ef8eb39fe46519afd29a' 
  AND token = 'jqEWGT737HIJxjsjblcBiF2sbZG/Hv9xVDcCLsF34Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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