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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed71cbcb2537059641ddef107db39c04103c9c00abdc0885cd5c07e35098beb6' 
  AND token = 'sAAXh5411brTCG/HG/Rw0e7pdhvUbDAzvmLKlC3MNfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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