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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84997fc93a0e3d101a94d8b1a867c308b3202db125b812fe5574ac6c74136a01' 
  AND token = 'Z/KJcc/N7+6QjerNiDlpKD82MEr59y+zU0bym2chnj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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