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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e62b7dc9967e0f526996c949d1fd6e9244647fb84402f0065655cf973166714' 
  AND token = '2HBvAKpfVoCiNhH1LQvPiPEmY6vX6A1ME34SO+VE60U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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