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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c47044be8f219ed645d28a6066399a79fa3e0d408ac9cd73e49c6d272707ed2' 
  AND token = 'OANwdPhdEKb9Yvz9QUQPhRO4MXvKsmabcqBnw3LH8Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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