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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0558d88e1760a14d21255ecd70e53acd6563a0139cdb24c24dabc8063073c765' 
  AND token = 'LSh6GL++AhpN9G0SPXx+apSEV/4R1c7hjnI6za6nzB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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