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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efaded08f49e7e7bc59c38af1ef4a7a26ec3ae5655aa9e3a3c384d4e1d4ac92' 
  AND token = 'FY21r15srT+lVleAAfupGgQNjy+2rw700ywieMUOr+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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