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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f095076b317a555c76f333c36f9b46ce401e6321405a27519833f25fb5b67697' 
  AND token = '9DnN7kAti3mSqKwnVer5p0hq2B0J40GnlDWBpaofIOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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