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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021811a28df79521d53f75fd9599fb612da92211827fa2e9f0e001e4977b6423' 
  AND token = 'rlXNJEBjVRaG5UA0atDob1knFbt0xiwZVquE4lTG/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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