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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ae38109966400bafc1841826013c2d683142b2017c917cdbe24d5951ff2db2' 
  AND token = 'nQ/mfFQwwRhJMIWWQP4aExfFl9428ROru2E2jJPUHy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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