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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3742215cd4df3bae0dd79ca317eb01879893306a8a86bebf31d8aa3e7e5b353' 
  AND token = 'OiflIVdfr2R0xGPA2od+aQsZ/xrR7HA4mLfOpHxzCP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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