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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea04cc5095b7fde79a587d355924fc3f9b2d13fd7f13f0b8bd9fa1296319ed1' 
  AND token = '+Sfu/0uxmEn+rjKmHYxgv3ktMKUfQI0+W8giJexQPVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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