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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa38271eb7004187fa8eb52381c982c273897d2f920e28d61f30528b53ca2d4f' 
  AND token = 'LJP4H+CTXvMS8ujTbYBmObU75r73oNoXleYo9N2Czgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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