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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e0324e8329ed8d0b05b0e9d16c40add268a747d0522e1f5324ec4cea285996' 
  AND token = 'NcS//U0IrgCSwRWxhVkwhZ70NJ55KpCOwBrVQOpu2ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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