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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a05dc6becaf2a425b0bc4c7430bc2fb87111a1a33bef97b68569774ff2d1e3' 
  AND token = 'uZYEubpMYx8pkbDgRQ5rmNcJqxfiDyA+JHKcOhVZFyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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