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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cef1682f2a54ffcc4921bb208bf3a53e4199fce06ae8a7809ffed5f6bcb69b7' 
  AND token = 'oSEkI7FICOk2ZroMDbEn4RlTiX0Q+j6iQeb8dthHMBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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