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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edea524e5ac109ce4dc048524361755e231b527415a1400990194970cfdf9c71' 
  AND token = 'i6+iTbQUQ6TghsQlV7QAsoRllVmL99eaQW2VMto9GWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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