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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c20c1f2a34ed252ea677427803b28ba9d1ec337a46915bfa655ee96a503cd92' 
  AND token = 'f6+4UgmoXZztejLrs2v6FWYybCbHCTnNu18n3RARtgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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