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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2527459a7f8c44cba60e6856e03b830bd320cc8a5eb55014f7fffa6ad8956d' 
  AND token = 'ju9/4clS0M4FA7I434pVkLJkRymzol6wRocrPPGN6so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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