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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29efd15d1e988ece6263b55d5032e3b99e5693524e2b6f5f1376b288dc092410' 
  AND token = 'PNt4jWe0qMAjfX3i2pqJuH4cgeAUr6m4R30oduxxba8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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