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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea6e464f1f1b1999c516cca307437117fe81e6a778c1703dbfd3e7fa1eabac9' 
  AND token = 'T+WXTTLC4ao2RJjVQI+l9wbAUzsjwrjJXndZlEuyMg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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