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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea61840e1eb010cc96aa6eb10acd569904906ba06449590ae0c3a075b074e86e' 
  AND token = 'JoYjZyqS3IsOIQmvU739XYPKkU3mF2wnT/lKdQhR5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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