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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bf8aa924ca2b10a7bd99a5bdd48888897594c316f6064f7e3caecddc78026e' 
  AND token = 'eFaYihlIIq2cdMlPgLSvEDfDfK7+W+GoNcC5f6vxKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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