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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1398a336e9c7a71377507efb3a4c7b9b73bc4ad0fb5f8d6c6e40f8678fa77343' 
  AND token = 'XPqngH2Ni8qX0nCRnsmzbDj9G5/1YIY+mU19UVfEl38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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