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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b633ac0939151241fc8179633fadca7cb3f4d45782c463694a2f44559204abf' 
  AND token = '2k4Zc/WHOrVoJMVW7qYVLIqfUfIoeYLrurfgyVcEDz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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