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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661d176b1081b49ca3e6323e06b243870089823b4626bb83fe272022b8be6d80' 
  AND token = '7wiJhvQdoirc1yA3YMyKkkHbH7CJUtBNhS+rioSJMMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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