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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c558f3f896028fdb50012c7fcae0b0e1b7faab20ee20db4b833e9a7f2fe3634' 
  AND token = '+OkQwvRzo+6vnOb7MzrUebfH+6XxqHTso+pAwi2avdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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