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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10228fa0c00b0e55ee320ff429b305303bd8309661e2ec60d1f999d4d834e60' 
  AND token = '6qNK/jcuy7TmQv6PGguvZV8ye9ZnaJsctGciernYRHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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