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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9707193edc25613f643325374fa94137a89ecec048726183901f65b89b7faae6' 
  AND token = 'KP8RSbrgeis6QpRWmUkIAIALDJRqW7m1tUrjgNajQMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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