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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0310fc2e01262b5d3ebd36a20067ad81ba98c6b8344300fb770806e49ba4adbc' 
  AND token = 'RwhhhtIrF0Hmpz41SRWZq2T7Z5cUO+6wPywXVKU4W+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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