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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dcd1fc25aabe6e40eb0354615f8fe7a73f88a2f545a63c6b8b58575caddbb0' 
  AND token = 'YctqE37kl1WyijER9Vpqvany0P8CHo1UpaxZpNylLOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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