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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfe9e8e2f71426e6f4b7e33922934b112453ffbe8291afba98f665b29eae74e' 
  AND token = 'CBqMCExPj+1rMDkDFOlm4BgwOqAs1U3haR63ch0umdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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