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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e439af988d196edf412b0711881e8ffee63f00438d99eece3f243c68e0dcef' 
  AND token = 'sZWivQM6czv/xRUI3XkAMXrCIZWEZC+T56DZ7Gfz38w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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