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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7690f077daf407baffbaad3e5f6f7c6318febda0e40c0f80cc81e172c6d18a' 
  AND token = 'ei8LtDmjpDuNoW2VVxT7TlsN78NOwg5/7ASS9vaqGxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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