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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d50e3287b2376473e77233ba9c3f9fcb6c9df5db9ab46c7f7b593fff356be46' 
  AND token = 'rmO+iOpKv8CjN4aR3VNEOqtrrWfGUw7PGQrpQvrIrao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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