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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4d3bccf19fc27445e6bc84e28515ab571d76bb330d0e59f57cad53ae6a1506' 
  AND token = '0PgRaQa55DK59/LKkazKRBfrhtMPgJdcUVzo8aeXGAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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