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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e91007698821129a5fa1c57c17bfe353c22e12993b00e7eadf3d65d90ee830b' 
  AND token = 'BwTSUJDVWHNE/Op7GgawoS9ScHX2XWaZKhfQdZ0k7z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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