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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f1a7229ce749455e2407571849414d95955d6b7522ee699bf6059a3489d75b' 
  AND token = 'oHpo2x0LMl4rx+CdCjESBUM2tbn6RrsLFZGg9sEs08A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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